whl-648 Rev. 001 Rel. 003 Date 10.8.19
51
K. 0-10 Volt Input
1. A signal from a building management system may be connected to the boiler to enable remote control. This signal should be a 0-10 volt
positive-going DC signal. When the 0-10V input is wired to the boiler terminal strip, a building control system can be used to control the set
point temperature of the boiler. The control interprets the 0-10 volt signal as follows; when the signal is between 0 and 1.5 volts, the boiler
will be in standby mode, not firing. When the signal rises above 1.5 volts, the boiler will ignite. As the signal continues to rise towards its
maximum of 10 volts, the boiler will increase in set point temperature.
2. Connect a building management system or other auxiliary control signal to the terminals marked for this purpose on the boiler terminal
block (shown in Piping Diagrams, this manual). Caution should be used to ensure that the 0-10 VOLT + connection does not become
connected to ground.
NOTE:
Ensure that the polarity of the connections from the external modulating boiler controller to the boiler is correct. Reversed polarity
could lead to erratic and/or no response from the boiler controller.
NOTE:
Outdoor Temperature Mode Icon on the display will flash if an Outdoor Sensor or 0-10 Volt is not connected to the boiler.
0-10 V INPUT TABLE:
When outside voltage is applied to the connector (2) in the wiring diagram,
1. The outdoor temperature sensor does not work.
2. The 0-10V symbol is displayed.
3. The heating temperature is automatically set according to the external voltage input.
NOTE:
0-10V is prioritized over T/T. If input voltage is less than 1.5V then T/T will operate.
The range of input voltage is approximately 1.5[V] ~ 10[V] and the heating temperature settings according to this range are as follows.
Figure 48 - Outdoor Reset Curve - See Installer Mode for Curve Setting Descriptions
Input voltage[V]
Heat temperature [
o
C]
Heat temperature [
o
F]
1.5
35.0
95
2.0
37.1
98.8
2.5
39.2
102.7
3.0
41.3
106.5
…
9.0
66.6
152
9.5
69
156.2
10
71.1
160
Table 29 - 0-10V Input Voltages and Associated Temperatures
Voltage exceeding 15V may damage internal parts. Such damages are not covered by product warranty.
See Figure 48 to set your Outdoor Reset Curve.
To check the CH Target Temperature while using Outdoor Temperature Mode, press the
button while the boiler is operational and the
display panel is powered on.
Summary of Contents for WBRC 140 Series
Page 21: ...whl 648 Rev 001 Rel 003 Date 10 8 19 21 E Applications Figure 10 Piping Symbol Legend ...
Page 40: ...whl 648 Rev 001 Rel 003 Date 10 8 19 40 Figure 33 Electrical Wiring Diagram ...
Page 41: ...whl 648 Rev 001 Rel 003 Date 10 8 19 41 Figure 34 Ladder Diagram ...
Page 81: ...whl 648 Rev 001 Rel 003 Date 10 8 19 81 Notes ...
Page 82: ...whl 648 Rev 001 Rel 003 Date 10 8 19 82 This Page Intentionally Left Blank ...
Page 83: ...whl 648 Rev 001 Rel 003 Date 10 8 19 83 This Page Intentionally Left Blank ...
